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On the determination of hardness and elastic modulus in BaFe2As2 lamellar-like material

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Abstract

The mechanical behavior of superconductor lamellar-like BaFe2As2 single crystals was investigated at nanoscale by instrumented indentation. The unique responses of the ab — and a (b) c-crystallographic planes were discussed based on their influence in hardness (H) and elastic modulus (E). The results allowed two main conclusions. (i) The choice of testing parameters strongly affected the scaling of mechanical properties on the lamellar surfaces. Lamellar cracking was the leading mechanism of deformation, featuring a brittle-like behavior and affecting considerably H and E. However, the plastic deformation history allowed different elastic–plastic responses on the ab -plane owing to the compaction of the material. Threshold loads for cracking depended on both loading rate and penetration velocity, pointing out to time-dependent plastic deformation mechanisms. (ii) Proper estimates were achieved for H in multiple loading tests [3.4 GPa for ab — and ∼1 GPa for a (b) c -planes], and for E under loads less than 3 mN (∼55 GPa for both planes).

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ACKNOWLEDGMENTS

The authors thank Prof. Dr. C.M. Lepienski (DEFIS/UFPR) for the use of the instrumented indentation facilities, Prof. Dr. A.L. Chinelatto (DEMA/UEPG) for some of the SEM images, the CME/UFPR for the use of SEM facilities, and C-LABMU/UEPG for the use of AFM. This work was partially financed by CNPq/Brazil under contract no. 472.746/2013-8. Work at the Ames Laboratory was supported by the US Department of Energy Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-07CH11358.

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Authors and Affiliations

  1. Department of Physics, Universidade Estadual de Ponta Grossa, 84.030-000, Ponta Grossa, PR, Brazil

    Gelson B. de Souza, Francisco C. Serbena, Alcione R. Jurelo & Simone A. da Silva

  2. Instituto Federal de São Paulo, 13.565-905, São Carlos, SP, Brazil

    Lincoln B. L. G. Pinheiro

  3. Department of Physics, Universidade Federal de Pelotas, 96.010-900, Pelotas, RS, Brazil

    Fábio T. Dias

  4. Universidade Federal de Santa Catarina, 89.218-035, Joinville, SC, Brazil

    Alexandre Mikowski

  5. Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa, 50011, USA

    Sergey L. Bud’ko, Alex Thaler & Paul C. Canfield

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  1. Gelson B. de Souza
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  2. Francisco C. Serbena
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Correspondence to Gelson B. de Souza.

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de Souza, G.B., Serbena, F.C., Jurelo, A.R. et al. On the determination of hardness and elastic modulus in BaFe2As2 lamellar-like material. Journal of Materials Research 31, 1413–1422 (2016). https://doi.org/10.1557/jmr.2016.166

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